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4-1 Alarm Messages
This refrigerated centrifuge has a self-diagnosis capability that identifies and reports a problem that occurs
when the instrument is starting up or in operation, and that affects the operation of the instrument.
When a problem occurs that affects instrument operation, the centrifuge beeps and displays
corresponding alarm message, in order to report the occurrence of the problem.
(1) Corrective actions
In response to the displayed alarm message, take the appropriate actions as described below to
remove the cause of the problem and then press the CE button to restart the centrifugation.
WARNING：Unspecified repairs, remodeling or disassembly of the centrifuge that is not listed below is
strictly prohibited by any person other than a Hitachi Koki authorized services representative.
After taking the actions, if the problem still persists, contact a Hitachi Koki authorized sales/service
representative to ask for repair.
Alarm message
POWER FAILURE
SET ROTOR COVER
OR ROTOR
INVALID ROTOR
TEMP
CLOSE DOOR
INVALID SPEED
SELECT ROTOR
IMBALANCE
ROOM TEMP
E10～95
4-1 Alarm Messages
Fig.4-1 Displaying an alarm message
Cause
A power failure occurred while the rotor was
spinning and the speed decreased by 300
rpm from the set speed.
If the rotor is rotating at 250 rpm or more
when the power is restored,
the
centrifuge
will
accelerate
decelerate if the speed is less than 250 rpm.
Operation is started without mounting
the rotor cover.
START button is pressed when no rotor is
installed.
The sensor on the back of the door
becomes wet.
The rotor in use is not registered in
the centrifuge.
The sensor on the back of the door
becomes wet.
Use the rotor without the adapter
TEMP display shows a temperature over
50 ºC, or a temperature lower or higher (plus
or minus 20 ºC) than the set temperature.
START button is pressed with the door
opened.
Rotor speed or RCF is set higher
than the maximum allowable speed or RCF.
Incorrect rotor is selected.
A rotor other than those saved in the
program is used.
Rotor is not properly balanced.
Rotor cover is not properly secured.
The room temperature is over 40 ºC.
The centrifuge has a problem required
maintenance by service personnel.
Alarm message
Check the run time if the rotor has stopped
and restart operation if necessary.
again
or
Mount the rotor cover properly.
Install the rotor.
Wipe the sensor with a soft cloth.
Register the data of the rotor (refer to
Section2-6-4 (4) for details).
Wipe the sensor with a soft cloth.
Use the rotor with the adapter
Lower the room temperature if it is over 40
ºC.
Close the door and start operation.
Set the speed or RCF within the permitted
limits.
Check the rotor and select the correct
rotor.
Check
allowable imbalance level.
Secure the rotor cover properly.
In order that the room temperature will be
less 40 ºC, lower the room temperature.
Contact
representative.
4-2
Corrective action
if
the
sample
tubes
a
Hitachi
Koki
exceed
service
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